Spray gun



Oct. 9, 1928.

G. E. TRISLER SPRAY GUN Filed April '7, 1924 Patented Oct. 9, 1928.

UNIT-Eo sT-Arts'.

PATENT .OFFICE GEORGE E. TEIsLEE, 0E SALEM, OHIO, AssI'GNon TO'THE DEMING COMPANY, OE SALEM, OHIO, A CORPORATION or OHIO. y

SPRAY*Y GUN.

Application led April 7,

This invention is concerned with improvements in spray guns7 which are used for spraying insecticideontrees, plants, etc., and more particularly this invention is directed toward improvements in ay spraying device set forth in Patent No. 1,348,631 issued August 3rd, 1920, to Wm. L. Deming and Cornwall. Briefiy, lthe device set forthin that patent embodies a tubular member having a nozzle adjacent one end thereof,rand having a hose connection at the other end.

. The present inventionv has for its objects the provision of a nozzle which embodies certain advantages over that illustrated in the above patent, such as simplicity in construction,` the reduction of hydraulic friction, the diminution of the tendency to clog, and the ease whereby the nozzlemay be cleaned.

The preferred means for carrying out my vinvention is illustrated in the drawings and is hereinafter setforth in detail in the following description. The essential features and characteristics of my invention are summarized in the claims.

In the drawings, Fig. 1 is a longitudinal section through a sprayl gunembodying my invention; Fig. 2 is a similar sectionon an enlarged scale adjacent the nozzleend of the device showing the closed position ofthe nozzle; Fig. 3 is a similar section showing the nozzle in open position, andFig. 4 is a section taken on the line 4-4 in Fig. 2. f

My invention is shown in connection with a spray gun having a tubular body or casing 10, one end of which is threaded to receive a hollowmrember v11, and theother endof which is threaded to receive a hollow member 12. rlhe members 11 and 12 support a head 13 and stem 14 respectively, by which the ilow of spraying fluid may be controlled.

Fluid may be led into the casing 10 through an oset portion 15 in the member 12 which is adapted to be connected to a hose 16. The member 12 is also provided with a stuiiing box 17, which functions not only to support the stem, but also to permit rotation thereof for controlling the movement of the head 13 and to provide a fluid tight joint between the member 12 and the stem.

The member 11 is illustrated as a casing, which is internally threaded at 2O and 21 with preferably square threads separated by a recess 22. Each thread is a continuation of thel other so that the head 13 which is externally threaded may be rotated continuously from 1924. Serial No. 704,656.

the thread 20 to the thread 21, notwithstanding the intermediate recess. The threads are preferably multiple-,triple threads being shown in the drawingto reducethe retarda-` tion Jof theifiowy through the final thread groove to the chamber behind the discharge opening. Multiple threads provide a plurality 'of openings intoA the chamber between the head 13 and the disc 26 whereby a. uniform rotation is given the liquid before it is discharged thru the .orifice 27. A steep pitch of thread is advantageous because it provides more direct and easy flow past the head. Thus the mutual desirability of easy -flowr and multiple outlets are com-y bined in multiple threads;r The member 11 is also threaded externally to receive a cap 25 which may be employed to position a disc 26 having a central opening 27 therein,y against a washer 28, whichinturn co-opcrates withthehead to provide a valve for controlling the liquid flow. 4

The `headv 13 is rigidly connected to the stem 14 A and is provided `with external square threads 3() so as to permit movementr of the head to the closed position shown in Fig. 2, or to the fully open position as shown iny Fig.

3. The head is provided with slots 31 preferably three in number,jwhich.extend longitudinally of the headr from the vinner end thereof to a point near the outer end thereof. These slots, therefore, provide passageways which eXtendin the general ldirection of liquid flow, thus obviating the necessity for a `member having small internal. passageways `which increase the hydraulic friction` and tend to become clogged by the particles held in .suspension in the liquid. Moreover, as shown in Fig. 3, the spraying liquid has relatively large passageways, Whenever the valve is in openv position.

The threads 30 on the head terminate short of the forward end of the head as shown in Fig. 3 which causes the spraying fluid to pass through the threaded portion 21v when the Y valve is partially opened and thereby to effect a spraying action of the Huid before it is ejected through the opening in the disc 26. The eXtent'of the spraying action may accordingly be controlled bythe position of the head with reference to the disc, the finest spray being Obtained when the head is nearest the y disc.

To limit inward movement of the head,'I have shown a sleeve 35 surrounding the stem and having one end thereof adapted to engage lugs which extend inwardly from the member 11. The other end of the sleeve is adapted to engage the inner end of the head. Outward movement of the head is limited by engagement with the washer 28. Axial movement of the head is obtained upon rotation of a handle 37 which is attached to the' outer end of the stem.

An advantage of a spray gun embodying my invention is that upon removal of the cap, disc, and washer, the stem may be turned suiliciently to permit the ejection of the head from the member 11, wherefor the slotted f passageways are readily accessible for cleansing purposes. Moreover, the use of slotted passageways in the head not only facilitates the manufacture of the nozzle, but also in* sures a more efficient operation vby reducing the hydraulic friction through the head.

y Having thus described my invention, I claim:

l. In a spray nozzle, the combination of a hollow casing member comprising the body of theynozzle through which fluid passes entering at one end of the member and discharging at the other end of the member, a conduit joined to the linletend of the casing member, the outletend of thecasing member being internally threaded with a multiple thread, a cylindrically formed'head of diameter equal to the internal diameter of the threaded portion of said hollow casing member, said head having multiple external threads on that portion disposed toward the inlet end of said hollow casing member, said threads being in engagement with the inner portion of the threads on'said casing member, the end portions of the headA disposed toward the discharge end of the hollow casing member being smooth and being in `contact with the outer .portion of 'the internal threads in the hollow casing member, 'said head havving'longitudinally extending slots cut in its lsurfacethrough thethreaded portion thereof and offaj greater depth than the depth ofthe threads, and extending in the direction of the flow of tluid a. limited distance beyond the external threads, thenumber of slots equalling the number of threads in thecasing member, means removably securedtoY the' discharge end of said casing and having a centrally disposed orifice, and a stem secured to the end of the head remote from the discharge -end nof the casing and extending through said conduit. n

y2. 1n a spra-y nozzle, the combination of a hollow casing member comprising the body of the nozzle through which fluid passes entering at one end of the member and discharging at the other end of the member, a conduit joined tothe inletendof the casing member, the outlet end of the casing member being internally threaded, aA cylindrically rformed head of diameter equal' to the internal diameter of the threaded lportion of said hollow casing member, said head having external threads on that portion disposed toward lthe inletend Y of said hollow casing member, Vsaid threads being in engagement with the inner portion of the threads on said` casing member, the side Surface of the head disposed toward the discharge end of the hollow casing member being smooth and being in contact with the outerportion of the internal 'threads in the hollow casing member, said head lhaving longitudinally extending slots .cut Vin its sur# face through the threaded portion thereofand of a greater depthythan the depth of the threads, and extending lin the direction of the flow of fluid a limited distance beyond the external threads, a cap removably secured to i the discharge end of said casing, a disc having a centrally disposed oriiice and an annular washer secured by lsaid cap against the discharge end of said casing, a stem securedfto L said head and extending throughsaid conduit and mea-ns for rotating saidstem vto vmove said head axially of said casing.

In testimony whereof, I hereunto aixmy signature. i "GEORGE'E,'TRISLER 

